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Since its arrival in North America, Aphis glycines (Hemiptera: Aphididae) has been managed using broad-spectrum insecticides to prevent outbreaks from occurring. However, genes conferring antibiotic resistance to A. glycines (i.e., Rag genes) occur in the soybean germplasm and are capable of preventing A. glycines populations from reaching outbreak densities in North America. Although soybean pubescence or trichome density is not a component of Rag-based resistance, it has historically contributed to the management of other soybean pests, like the potato leafhopper (Empoasca fabae Harris). However, there is limited documentation of trichome impact on A. glycines in North America, especially in relations to Rag resistance. Our objective was to determine if varying trichome density limits A. glycines population growth. To determine the impact of trichome density on A. glycines populations, we compared 10 soybean isolines that varied by the density of trichomes that were present in a controlled laboratory setting. In addition, we included A. glycines-susceptible and -resistant (i.e., containing Rag1 and Rag2) varieties as positive and negative controls, respectively. Overall, the 10 soybean isolines used with varying trichome density were not significantly different from the A. glycines-susceptible control. These results suggest that trichomes are not useful for management of A. glycines populations.

Impact of soybean trichomes on Aphis glycines (Hemiptera: Aphididae) and their interaction with natural enemy abundance and predation